Aqua Craft Inc USA Bio Sea Salt BIO-SEA® Marinemix manufactured by Aqua Craft®, Inc. USA (What the manufacturer claims) (printing on the 50 U5 gallon/189.25 liter bag) Net Wt: 15 lbs. (6.8 Kg) With the exception of slightly elevated levels of sulfate, BIO-SEA® Marinemix is the only salt that consistently tested with major ions/elements in proportions similar to Natural Sea Water (NSW). Enhanced amounts of select minor elements are included for the positive growth of captive reef pets. All claims on the package are accurate. Ideal for all marine fish, corals and reef life. De-chlorinates. Maintains pH. No phosphates. No nitrates. Highly soluble. PREMIUM SALTWATER FORMULA. GUARANTEED to contain all elements. Laboratory tested & certified. (The package then offers instructions for mixing and using the product.)